What are the various legal aspects to have a credit card?

The card holder alone is responsible for any debt incurred. Which means if you loan it to a friend and they max it out, it is still your debt. The card holder has to take reasonable care not to let the card or the information be obtained by unauthorized person(s)And of course you gotta pay what you owe, or they get really, really grouchy. They can do other not so nice things to collect also.